Why are the echinaceas that I planted 3 years ago so slow to grow? Some of them continue to have only a few flowers, with the plant hardly becoming larger, and one, the "Paradoxa", is just languishing with no great growth spurt from last year and no buds. They are in a great garden environment with all of the other plants flourishing and producing a great show of flowers! These are supposed to be easy in my area .... zone 5 !! What's the problem?
